Typically alot of Pdocs hit someone with Zyprexa on top of there current meds to slam that mania down and allow a person to get much needed sleep that will help break the mania cycle. Cogentin isnt a medications that is use for any sedating effect.

Are you on straight Seroquel? or the XR? Most people report the XR is much more sedating and longer acting as thats its formula .

I would ask about Zyprexa if only for a short term to help the mania. yes it causes weight gain but as a short term you should be able to manage that for a lil while.

Good luck